Some of the confusion might be because there are different versions of mt-daapd with different ways of making playlists.
With 0.2.x, it’s done through the .playlist file. To do that, try something like:
"Incoming Files" {
path includes "/incoming/"
}
WIth nightlies, you can edit it through the “smart” tab on the web ui, and add a criteria like this:
path includes "/incoming"
The syntax on that is almost identical, but it’s stored in the database on nightlies rather than a separate file.
— Ron